Algonquin C. Lumpus is an angry, selfish, stingy moose with a large ego. He is a secondary antagonist of the show. Tom Kenny voiced Lumpus. Murray originally created Lumpus as a horse; Murray changed the design to a moose when the design seemed more "mountain" [sic] to the Camp Lazlo creator. Murray experimented with voices, imagining (and later disliking) a "Don Knotts"-like voice. Murray described Kenny's voice as a "crazy mix of Richard Nixon and W. C. Fields." Murray stated that he enjoyed writing situations involving Lumpus as the character that had "no morals and zero conscience". It was revealed that in some episodes, Lumpus was a former Bean Scout from the same camp when he was a young kid. He is always in a bad mood and this horrible disposition could have been caused by his parents' failure to visit him at camp when he was a Bean Scout and tell him that they love him or even show any signs of care for him. It was seen in the episode "Slug Fest" that Lumpus does appreicate Slinkman. As Camp Lazlo episodes entered production, Slinkman, Lumpus's right-hand man, takes increasing control of the camp as Lumpus increasingly becomes mentally incapacitated. In a way to show difference between characters: Lumpus loves clowns and Lazlo hates clowns.
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